auxiliary UK /ɔːɡˈzɪl.(j)ə.ɹi/US /ɔɡˈzɪl.(jə).ɹi/adjective 5noun 4forms 1 adjective5 •Helping; giving assistance or support.auxiliary troops •Supplementary or subsidiary. •Relating to an auxiliary verb. •Held in reserve for exceptional circumstances. •Of a ship, having both sails and an engine. noun4 •A person or group that acts in an auxiliary manner.A drive to exploit the Highlands as a winter sports area, with all the necessary auxiliaries, such as chair lifts in the Cairngorms, shows increasing promise, […]. — 1962 •Ellipsis of auxiliary verb. •A marching band color guard. •A sailing vessel equipped with an engine. formsauxiliaries